<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <h3>{{ count }}</h3>
    <button @click="changeCount">+1</button>
</div>
<script src="../../JavaScript/vue.js"></script>
<script>
    const app = Vue.createApp({
        data() {
            return {
                count: 0
            }
        },
        methods: {
            changeCount() {
                this.count += 1
            }
        }
    })
    app.mount("#app")
</script>
</body>
</html>